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FEBS Lett. 2007 Aug 7;581(20):3875-81. Epub 2007 Jul 17.

Variable actin dynamics requirement for the exit of different cargo from the trans-Golgi network.

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Departament de Biologia Cellular i Anatomia Patològica, Facultat de Medicina, Universitat de Barcelona, C/Casanova 143, E-08036 Barcelona, Spain.


Efficient post-Golgi trafficking depends on microtubules, but actin filaments and actin-associated proteins are also postulated. Here we examined, by inverse fluorescence recovery after photobleaching, the role of actin dynamics in the exit from the TGN of fluorescent-tagged apical or basolateral and raft or non-raft-associated cargoes. Either the actin-stabilizing jasplakinolide or the actin-depolymerising latrunculin B variably but significantly inhibited post-Golgi traffic of non-raft associated apical p75NTR and basolateral VSV-G cargoes. The TGN-exit of the apical-destined VSV-G mutant was impaired only by latrunculin B. Strikingly, the raft-associated GPI-anchor protein was not affected by either actin toxin. Results indicate that actin dynamics participates in the TGN egress of both apical- and basolateral-targeted proteins but is not needed for apical raft-associated cargo.

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